linux/scripts/dtc/fdtdump.c
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   1/*
   2 * fdtdump.c - Contributed by Pantelis Antoniou <pantelis.antoniou AT gmail.com>
   3 */
   4
   5#include <stdint.h>
   6#include <stdio.h>
   7#include <stdlib.h>
   8#include <string.h>
   9#include <ctype.h>
  10
  11#include <fdt.h>
  12#include <libfdt_env.h>
  13
  14#include "util.h"
  15
  16#define ALIGN(x, a)     (((x) + ((a) - 1)) & ~((a) - 1))
  17#define PALIGN(p, a)    ((void *)(ALIGN((unsigned long)(p), (a))))
  18#define GET_CELL(p)     (p += 4, *((const uint32_t *)(p-4)))
  19
  20static void print_data(const char *data, int len)
  21{
  22        int i;
  23        const char *p = data;
  24
  25        /* no data, don't print */
  26        if (len == 0)
  27                return;
  28
  29        if (util_is_printable_string(data, len)) {
  30                printf(" = \"%s\"", (const char *)data);
  31        } else if ((len % 4) == 0) {
  32                printf(" = <");
  33                for (i = 0; i < len; i += 4)
  34                        printf("0x%08x%s", fdt32_to_cpu(GET_CELL(p)),
  35                               i < (len - 4) ? " " : "");
  36                printf(">");
  37        } else {
  38                printf(" = [");
  39                for (i = 0; i < len; i++)
  40                        printf("%02x%s", *p++, i < len - 1 ? " " : "");
  41                printf("]");
  42        }
  43}
  44
  45static void dump_blob(void *blob)
  46{
  47        struct fdt_header *bph = blob;
  48        uint32_t off_mem_rsvmap = fdt32_to_cpu(bph->off_mem_rsvmap);
  49        uint32_t off_dt = fdt32_to_cpu(bph->off_dt_struct);
  50        uint32_t off_str = fdt32_to_cpu(bph->off_dt_strings);
  51        struct fdt_reserve_entry *p_rsvmap =
  52                (struct fdt_reserve_entry *)((char *)blob + off_mem_rsvmap);
  53        const char *p_struct = (const char *)blob + off_dt;
  54        const char *p_strings = (const char *)blob + off_str;
  55        uint32_t version = fdt32_to_cpu(bph->version);
  56        uint32_t totalsize = fdt32_to_cpu(bph->totalsize);
  57        uint32_t tag;
  58        const char *p, *s, *t;
  59        int depth, sz, shift;
  60        int i;
  61        uint64_t addr, size;
  62
  63        depth = 0;
  64        shift = 4;
  65
  66        printf("/dts-v1/;\n");
  67        printf("// magic:\t\t0x%x\n", fdt32_to_cpu(bph->magic));
  68        printf("// totalsize:\t\t0x%x (%d)\n", totalsize, totalsize);
  69        printf("// off_dt_struct:\t0x%x\n", off_dt);
  70        printf("// off_dt_strings:\t0x%x\n", off_str);
  71        printf("// off_mem_rsvmap:\t0x%x\n", off_mem_rsvmap);
  72        printf("// version:\t\t%d\n", version);
  73        printf("// last_comp_version:\t%d\n",
  74               fdt32_to_cpu(bph->last_comp_version));
  75        if (version >= 2)
  76                printf("// boot_cpuid_phys:\t0x%x\n",
  77                       fdt32_to_cpu(bph->boot_cpuid_phys));
  78
  79        if (version >= 3)
  80                printf("// size_dt_strings:\t0x%x\n",
  81                       fdt32_to_cpu(bph->size_dt_strings));
  82        if (version >= 17)
  83                printf("// size_dt_struct:\t0x%x\n",
  84                       fdt32_to_cpu(bph->size_dt_struct));
  85        printf("\n");
  86
  87        for (i = 0; ; i++) {
  88                addr = fdt64_to_cpu(p_rsvmap[i].address);
  89                size = fdt64_to_cpu(p_rsvmap[i].size);
  90                if (addr == 0 && size == 0)
  91                        break;
  92
  93                printf("/memreserve/ %llx %llx;\n",
  94                       (unsigned long long)addr, (unsigned long long)size);
  95        }
  96
  97        p = p_struct;
  98        while ((tag = fdt32_to_cpu(GET_CELL(p))) != FDT_END) {
  99
 100                /* printf("tag: 0x%08x (%d)\n", tag, p - p_struct); */
 101
 102                if (tag == FDT_BEGIN_NODE) {
 103                        s = p;
 104                        p = PALIGN(p + strlen(s) + 1, 4);
 105
 106                        if (*s == '\0')
 107                                s = "/";
 108
 109                        printf("%*s%s {\n", depth * shift, "", s);
 110
 111                        depth++;
 112                        continue;
 113                }
 114
 115                if (tag == FDT_END_NODE) {
 116                        depth--;
 117
 118                        printf("%*s};\n", depth * shift, "");
 119                        continue;
 120                }
 121
 122                if (tag == FDT_NOP) {
 123                        printf("%*s// [NOP]\n", depth * shift, "");
 124                        continue;
 125                }
 126
 127                if (tag != FDT_PROP) {
 128                        fprintf(stderr, "%*s ** Unknown tag 0x%08x\n", depth * shift, "", tag);
 129                        break;
 130                }
 131                sz = fdt32_to_cpu(GET_CELL(p));
 132                s = p_strings + fdt32_to_cpu(GET_CELL(p));
 133                if (version < 16 && sz >= 8)
 134                        p = PALIGN(p, 8);
 135                t = p;
 136
 137                p = PALIGN(p + sz, 4);
 138
 139                printf("%*s%s", depth * shift, "", s);
 140                print_data(t, sz);
 141                printf(";\n");
 142        }
 143}
 144
 145
 146int main(int argc, char *argv[])
 147{
 148        char *buf;
 149
 150        if (argc < 2) {
 151                fprintf(stderr, "supply input filename\n");
 152                return 5;
 153        }
 154
 155        buf = utilfdt_read(argv[1]);
 156        if (buf)
 157                dump_blob(buf);
 158        else
 159                return 10;
 160
 161        return 0;
 162}
 163
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